DET retrofits consist of a stainless steel /ceramic tower custom mounted on the existing FID/NPD base on the GCThe tower can accommodate DET hex flanged ion sources such that the ion source is positioned on the axis of a collector electrode cylinder. This concentric cylinder geometry provides a streamlined gas flow through the detector, and an optimum electric field for ion collection.For a complete detector, add an Ion Source (USD350) to the following assemblies.

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THERMO TRACE GC: NPDITID/FID Tower Assembly, part #010-860-55, $1800 USD. DET hardware and ion sources are compatible with Thermo's NPD electronics which provides Constant Current ion source heating and a wide range of polarization voltage selections. This combination of DEThardware and Thermo NPD electronics provides the most versatile NPDITID detection currently available. Different modes of detection are achieved by simple changes in the type of ion source, and in the type of detector gases.

VARIAN GC MODELS: NPDITID/FID Tower Assembly, part #010-860-20, $1550 USD.DET hardware and ion sources are compatible with Varian's TSD electronics which provides Constant Current ion source heating at a fixed polarization of -4 V. For modes of detection other than NPD, a stand-alone DET Constant Current Supply provides a selection of higher polarisation voltages which provide more sensitive detection than the Varian supply.Optional DET Current Supply, part #001901-01 (115Vac), $1760.

SRI INSTRUMENTS: NPDITID/FID Tower Assembly, part #050-864-98, $2350 USD.DET hardware is compatible with signal measurement using SRI's FID/NPD amplifier. DET ion sources with a bare wire termination can be powered with SRI's NPD electronics, but setting power levels is not very user friendly. An improvement is to use the stand-alone DET Current Supply described above, and ion sources with a Twinex connector . . . as is standard on Agilent, Thermo, and Varian instruments.HP 5890 (same equipment fits the FlD base on an Agilent 6890)

NPD/TID/Remote FID/FTID Tower Assembly, part #040-862-12, $1850 USD.DET hardware is not compatible with the 5890 detector electronics,so the stand-alone DET Current Supply and a stand-alone Electrometer (Keithley 6480 Picoammeter recommended) are required.In addition to NPD and TID modes, this equipment can be used for a Remote FlD mode for selective detection of P, Sn, Pb, and Si, or an FTID mode for selectivity to N and CI. DET Current Supply as above, USD1760; Keithley Picoammeter, $1800.USD

An Extensive LIBRARY of Selective Detection Applications

sub-picogram detection of NP pesticides and drugs ( NPD )

exceptional femtogram sensitivity for Nitro explosives liek2,4-Dinitrotoluene and TNT, as well as Nitro pesticides like Methyl Parathion (TID-1 mode )

CERAMIC ION SOURCES (Beads) for the NPD (Nitrogen-Phosphorus Detector) and OTHER TID (Thermionic Ionization Detector) MODES, INCLUDING REPLACEMENTS for the AGILENT 6890/7890 NP ION SOURCE (Highest Quality, Best Performance, Lowest Cost, Unlimited Shelf Life). A family of different ceramic coatings provides an easy change from one mode of selective detection to another using the same basic equipment. An ENVIRONMENT FRIENDLY RECYCLING OF DEPLETED ION SOURCES is available for any DET, Agilent, Thermo, SRI, or other brand NPD.

PTIDPrinciple of Detection : Samples decompose in an ignited H2-Air chemical boundary layer around a hot thermionic surface. High H2 and Air flows suppress N response and provide very large P signalsPTID Phosphorus Selective p11

TID-1 and TID-3 : modes of detectuion are simple, inexpensive modifactions of Agilent 6890 or DET NPD equipment. Both operated with a detector environment of either N2 or Air ( NO H2 required ) depending on the selectivity required.The ceramic coated TID-1 source is electrically heated to an operating temp of 400-600C, while TID-3 is 600-800C.Both ion sources are polarised at -45V with respect to the surrounding ion collector.Ion source polarisation and heating power are provided by a stand-alone DET Constant Current Supply moduleTID-1 and TID-3 ion source configurations fit into the Agilent 6890 NPD equipment and into DET NPD equipment designed to mount onto HP5890, SRI8610C or Varian GCs.Negative ion detection signals can be measured with the Agilent 6890 NPD elctrometer, Varian TSD electrometer, SRI FID/NPD electrometer or with a DET electrometer.